Example: Setting Up Dhcp Option 82 On An Ex Series Switch With No Relay Agent Between Clients And Dhcp Server - Juniper JUNOS OS 10.3 - SOFTWARE Manual

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Example: Setting Up DHCP Option 82 on an EX Series Switch with No Relay Agent
Between Clients and DHCP Server
Requirements
2898
®
OS for EX Series Ethernet Switches, Release 10.3
Example: Setting Up DHCP Option 82 on an EX Series Switch with No Relay Agent
Between Clients and DHCP Server on page 2898
Setting Up DHCP Option 82 with the Switch as a Relay Agent Between Clients and
DHCP Server (CLI Procedure) on page 2926
RFC 3046, DHCP Relay Agent Information Option, at
You can use DHCP option 82, also known as the DHCP relay agent information option,
to help protect the EX Series switch against attacks such as spoofing (forging) of IP
addresses and MAC addresses, and DHCP IP address starvation. Option 82 provides
information about the network location of a DHCP client, and the DHCP server uses this
information to implement IP addresses or other parameters for the client.
This example describes how to configure DHCP option 82 on a switch with DHCP clients,
DHCP server, and switch all on the same VLAN:
Requirements on page 2898
Overview and Topology on page 2899
Configuration on page 2900
This example uses the following hardware and software components:
One EX Series switch
Junos OS Release 9.3 or later for EX Series switches
A DHCP server to provide IP addresses to network devices on the switch
Before you configure DHCP option 82 on the switch, be sure you have:
Connected and configured the DHCP server.
NOTE: Your DHCP server must be configured to accept DHCP option 82.
If it is not configured for DHCP option 82, it does not use the DHCP option
82 information in the requests sent to it when it formulates its reply
messages.
Configured the employee
the clients and the server connect to the switch with that VLAN. See "Configuring
VLANs for EX Series Switches (CLI Procedure)" on page 1378.
VLAN on the switch and associated the interfaces on which
http://tools.ietf.org/html/rfc3046.
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